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Case 5: Weight = 4

If these 4 points form a quadrangle, then this is a codeword and no single change to it will result in a codeword. If these 4 points do not form a quadrangle, then, they must correspond to a line and a point outside of the line. Removing that nonlinear point decodes to a line. No other single change results in a codeword.

Bill Cherowitzo 2001-12-11